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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7ad7dab10f01b42fb9d7abbc35bee91c4906bea8ba4ab108ecb7da66e2ef64' 
  AND token = '7Ic9kzD4iwkEejFA8v8LO8XiuV8trFwHl0DeJkun0cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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