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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c28ec45b6e62726ff9f334ae2047d4e8ec7a759a67481808faff654644128c' 
  AND token = '71KWsCM76S9Pknc7F+ImYl/Buw+L/1SCd2MDLW/N8LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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