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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b0010cfd1fcc1e4eb3a5676f155653939d8948d6b3beb01805140c28338d548' 
  AND token = 'Fuj4ETyPdVOYP4TMFWjckMcM3K4tgcQomy4vYLoFiFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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