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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab6f8546d4d8bb31cd8aa0d6081156684439ef760ac71cc46dec3c47e7294bd' 
  AND token = 'bCL0rM7Dq6IKN9iDdTr5xmTqxhUskeO76fNtEt6SxZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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