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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b76f0355356ea90ff1c8541206b3b1248c6274730e79a6ec5a81ea3463640fa' 
  AND token = 'w/Ql0PgqqfU0c31JAGP9eFLRP08WjReW6i4mxyZkPGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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