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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13fd47fffa9edfd23b606af93fe80c7ff98aa45833890943678d56b3adac5924' 
  AND token = 'uzkP2WLDpH54+PU4YJSylguPzoknpiFrEtt3p6KK96M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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