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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '640c009c691a096f371d4453d6ef057b26fd84d7de43c64814bf3b74e82c456c' 
  AND token = '7hYqlQIsAe78LyZD4xnkL1Tkr1ViNjRGOwF2EoCnpzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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