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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a2dbdbca5f5f6bfaa103b968a4116a7a5b562085ec529142674cd98f89b9ba' 
  AND token = '7apCzpIHMsOzyDi5WAA76itaba63Yprlqf/QW1q2N0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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