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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0376b994d2d3b18af24880707c797dc6427953f1c0b3b63285b93daca6139c10' 
  AND token = 'dzIl4Yog51k7AwnGP1riOib+YPFJDM7zRZw9MDOjNF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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