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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc283f057ccb4129688f18cbe0a1b5de6fc65620149943556aef72b1ae773edf' 
  AND token = 'h6DvaArtlL6b4ytvGXsdODq1UDDdcjfQhYZ3RW9O3Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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