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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f8fdd70f7b9d539d62dbd8c8e0d54a9ee6f41ea983ec8278fa846f8095f50e' 
  AND token = 'jfM5kQE0Vu8p1e3BGx0H18x71iAgXYDYBsJWr2bSAR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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