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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96ec4158a13dc943e8fa27eca3083e5190e994d261b2848dafce2b269eb0d18' 
  AND token = 'jf5hIFGic8gkqIc5lSNUkO//2WfHbI5deQYmFIcgEZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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