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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615272fe54f22cd0b7459e6c7a7121736278db69a749308dd62a57692e4024de' 
  AND token = 'RlNi1xl0vexGX9nshabyF3CtAPxStGSG4P7yhT+PYLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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