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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c831901e74bdf08612280ee1f37f413cd3f3998df6c8ff23d430a4df33a0302' 
  AND token = 'aBDaecAE30F7xbNXhvlHHSqY4Tps493KfET0vDU2H2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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