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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82163b1f9afafb2effe0d877d1ec66b96b2519e062818d77413af3a01afc51f' 
  AND token = 'lqI2NSnWIdwsbGnJotR6i7VB575iG3C2nD6l+/4YxcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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