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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd099efe6addd13bf985c1a5581d6f91601786ca4b62bad10bfa9ca70724cb968' 
  AND token = '27C8qOCD5Gl9gqAtQChhfK2OI9nm3PsoTPLk53EfQNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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