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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec5fd8b6aae7d2ddbbfcce3bbc7976e16e4575032ce9a39919f6830246fb0bd' 
  AND token = 'I+/Pl1P1/qkt+3JkUlQvJWJIPwd7K7wRXys8UC0yLg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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