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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c55ddd8d3eb159f05497017f39f6ef7cf5a1ea2b1e20bfb6caada36791f57b' 
  AND token = 'fMHv3qEvKYizZMQnO9N7VZzPjL0Vyp2vTochR26vIis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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