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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a45074b1920d296e40be7918237392f6250a380cdee279fd0e6f69300cf247dc' 
  AND token = '9cO8O9wQXWosBOucVLYNJN/dCIM/sXmw4YkzkSUK6Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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