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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b568b0ff0e06b92d5277f6493eb451b6232494c83fbe5ba1c7412fccb6bddb0' 
  AND token = 'w3/j9f382kkC5WK9rvAc8JgblX/61uWrnV+tzDK/5l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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