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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de4910676a03d139faae0fd59c569cc875acd33bccb35c19b76bf8d17c859c9' 
  AND token = 'XwEu4cfoRgVGACyMOFF9brZzBSOTWp7K5dhBVlsxN4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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