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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bba271ce7223cd98af3f346806c9f7e6823db83247f40903d028c243ac7e084' 
  AND token = 'zEiFfTpYmN5NzpoOimscT5srKMcQQtacHiMvTECHCW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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