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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a4e41c7c2d22018a93cf4780db180dfeb32751c374046a1f77c5d64ed8aacc' 
  AND token = 'kr1x6ZD4I6vGRmsfYuPpT6WdqIRnHmwcKqqRy/DTfHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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