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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fffb7e50eb519224212d5acd2fc21c370caf668ce36b388af84efb41bd862a5' 
  AND token = 'e4HiIbWxHlWgvRwEukTx+H60Dsoem7nKGDNgSwjcyYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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