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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f849d0e6207d8c7e8c35b0696e12187a14715eadb7debb6a9b166dc020887e74' 
  AND token = '23yekoQxyYwUe3DeiBGUAhWRu0sqO5JcwLSk1MIovoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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