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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b120994a3870a0576baf68e86cfc31b14c63d4e91a0ed7b039818b71fb370ed6' 
  AND token = '1gWSyAMO2u880HReLfVvIXh11F0MixmKsdTNVB67laU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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