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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e29309b59dd6ccd89be547f10ad18dc05190670af81ee7b035b9be3cef4eeef6' 
  AND token = '0pNuko2uOFuTP6MurzJDGP1CyCPhNY16yohmfQV8z9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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