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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b02b1825df57a6f20888fc24815ebb44025dc38dd17a05765b3ee08e5e20bf6' 
  AND token = 'BgQ9xV5y/kVFX8dcASiC4zqKMf93VehE/jkrF0fmLbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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