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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132e9a1f8e50c8ff2a6580566340d40564d8137f20195fa6dd4c17b067e321db' 
  AND token = 'Kn98xlf6es2OBZDdRX4TP3E0NoLYppa1vwNoUfWnSRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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