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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3431eee00fd25a863269b706bb9a65e91a976b47fce0cae13cde4aa8928f5d3e' 
  AND token = 'O3faT/UYcOGqczXG+g5Oi3IdZzxo3MXejJbEKSd6txc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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