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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48374030daceeb6a7f372915b1facd9446b296d39b19f37af953bb85b93096e9' 
  AND token = 'iTKqZF2W/SUAXpM1Knb4bruycmFe29Leqhis8svx+aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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