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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db7c231ba4205a8c6f3648c2b67262f14a29a6a9a19fc77ea3dd672f9d020ea' 
  AND token = 'gyqJulSLdPBHXqDIct08z90TfBe8GbGErTtW/+agQ74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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