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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c261d0ed0c07d4dd59aaef6d3094f7b1143736a5f0e3bcb0951e1b8fe3f4cde' 
  AND token = 'kEprIahlv7d85tIu3rBfsoIlvrXvuG6kYClu7yQnkYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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