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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000aaadd8a1fc471e77b2b74d52f5d80fac529f7cf9ef4c9ead9facef2f9928f' 
  AND token = 'YLFUmaC2xouXy7WCoHyW0dU7FYaCm2u2QxrQ/97fXXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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