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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f16170760e4dddbb0e17272e79816aa2230de779a49045e217e567b6a9a0ab5' 
  AND token = 'oD2E4QBBrC9LNHEHr4I2Jsg1nl8AdClErIEtzvaZVjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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