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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db32ea1efc8578113b7e8647ee086b011d15a368d4ed834ba8940b6fbcee360' 
  AND token = 'Z/rRyBXKnw+/ENKlDRmaQml0BFHykBm0QWYg/LjlhoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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