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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0704e6ba56ab95290447ebbecafdfaac434d7740a7cae377794c797448b7e6a2' 
  AND token = '1VF8664fPTMJAhlDJaaNpwDB0M3YOm9tfOnn41RRLuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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