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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5901640579e3363a592ca78bb116a2c3d628630a03a9cee25316770482014a0' 
  AND token = 'lcX+VoYHiHyrlt5eLVhJYl8ZJa0NaSmxoPukAAbGyWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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