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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf54c9679b0e813e22c52bb1d2de035c3c130dae92301eab2ed11e4d492b084' 
  AND token = '/uGARJV6V+VXgdoJvsiGKQGmKVurz2TxqkmDIyWY78E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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