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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e2edcf1cbee73f846846d5f0fd182776b1d227b08e21d4dd90f61592f6c07e' 
  AND token = 'ZB27I2u3oV2e1nNAgStLZ8fNpwJbbkTJ9++/mCtcgm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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