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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6be4ff159579cbc85d90d459182c77c81ae90b502c84363ad7b9043286d5739' 
  AND token = '2NIZlFs2ddfJrzlicv8ZbZX+BycuBmDT48QJMCx1T+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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