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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5190628bc0d1269e23c6d06eb0da40f7709efb3f17206b6e120a0c9a0ab7574' 
  AND token = '++UM5tKpmP2eV9IdyUR7FVNnD7suQIfb1qc/JWPEBK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}