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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3142426d15cdb6dfa819e41f480916957eccc11d71652b8d29d226f7b0a59175' 
  AND token = 'QHp/Kod/OKGpKnewSq0owM79NvCMoRl6D6EPW2qbu1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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