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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd736642791c8ab084ca77f6f28505a19b646e88ee51b11f83874798d291e3ffc' 
  AND token = 'dTZB4j59cSVf6svBymJ1sGNNeF+9MuWQG2uAZyNwhk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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